Aug 1, 2019
The flow behavior of a fluid is described by its movement.
A vortex forward movement is called turbulent flow.
A tube with a Reynolds number higher than approximately 4000 will have this kind of flow behavior.
Because of the turbulent flow new coolant is brought to the wall of the cooling channel to take on heat.
After that it will move to the center of the cooling channel and from there back to the wall.
Due to this movement more heat can be taken by the coolant and hence the cooling is more efficient.
Therefore turbulent flow is recommended for a coolant.
May 25, 2021
Granulate for the production of plastic parts is usually fed to the injection molding machine via a permanently installed hopper. If the material is changed frequently or if small quantities of material are processed, the fixed hopper is unsuitable for handling.
In order to apply e.g. cleaning granulate safely and without spillage at the injection molding machine, a universal hopper is therefore ideally used. This has a magnetic base and can be quickly replaced on the machine. With an integrated closing slide, an exact and economical dosage of the respective material is made possible. This means that a universal funnel is also ideal for sampling or for processing very small quantities.
Injection molding process:
CAD data set of a
universal funnel for use on any injection moulding machine
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Mar 5, 2024
If a USB device, such as a printer or an external hard disk, is to be integrated into an existing network (LAN), a USB server is required.
This enables several computers connected to the network to access the device.
The USB server has an RJ45 connection, as well as its own power supply and a socket for connecting USB devices.
The USB device is configured and made visible on the network using special software or a web interface.
The connected USB device can be used in the network via an assigned IP address (static or via DHCP).
Automation technology:
USB server with connected USB hard disk
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Nov 27, 2018
Nozzles in the hot runner system are divided into open and closed nozzles.
Closed nozzles can be opened and closed with the help of a steel needle, therefore the name valve gate.
The needle pushes the gate flat and only a single round mark is visible after closure of the gate.
The filling and packing phase can be influenced directly by the control of the needle.
Dec 6, 2018
In the injection mold, in general, every cooling circuit stays at one temperature over the complete cycle.
For parts with a high demand on surface quality it is important that the melt reproduces the cavity perfectly.
A variotherm process is used to achieve this.
Hereby one or more cooling channels will be processed with a lot higher temperature during filling phase (A in the picture below).
As this results in a longer cycle time, the coolant temperature is decreased during cooling phase (B in the picture below) to speed up the process.
The phase of mold movement (C in the picture below) is used to heat up the coolant of the specific circuits to the higher temperature for the next cycle.
